Many fractions, an infinite number of them, have a sum of 1. One example is 1/3 + 2/3. Another example is 1/4 + 3/4.
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1-a, which may or may not be a fraction.
The two fractions are -181/2 and 191/2.
The sum of two fractions will only be a whole number if the fractions have a common denominator. When the denominators are different, the sum will be a fraction with a different denominator, making it impossible to be a whole number. Thus, estimating the sum of two fractions will generally result in a fraction, not a whole number.
6.9 or 69/10
Only if one of them is negative, eg: 31/2 + (-11/2) = 2 Otherwise both are positive and no: A mixed number has a whole number greater than or equal to one plus a fractional bit, ie a mixed number is of the form 1a/b (1 and a fraction), 2a/b (2 and a fraction), 3a/b (3 and a fraction), etc Adding two such numbers together must be at least: (1 and a fraction) + (1 and a fraction) = 2 + (the sum of the fractions) which must be greater than 2 and cannot equal 2 (as both the fraction are positive and their sum is greater than zero).